<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .container {
          background-color: red;
					width: 960px;
					margin: 0 auto;
					}
		.left {
					float: left;
					width: 220px;
          background-color: darkblue;
					}
		.content {
					float: left;
					width: 480px;
          background-color: burlywood;
					}
		.right {
      background-color: blue;
					float:left;
					width: 220px;
					}
  </style>
</head>
<body>
  <div class="container clearfix">
    <div class="left">12</div>
    <div  class="content"></div>
    <div class="right"></div>
  </div>
</body>
</html>